研究目的
Investigating the stability of physical properties of ZnO nano rods under shock wave loaded conditions for aerospace and military applications.
研究成果
ZnO nano rods exhibit high molecular, optical, structural, and morphological stability under shock wave loading up to 150 pulses, with only a blue shift in UV-Vis spectrum at 200 pulses indicating minor optical changes but no structural degradation. This stability is attributed to strong covalent bonds, short bond length, and stable grain structure, making ZnO NRs suitable for aerospace and military applications where resistance to extreme conditions is critical. Future work could explore higher shock counts or other nanomaterials.
研究不足
The study is limited to shock waves up to 200 pulses; higher counts or different shock parameters were not explored. The shock tube is semi-automatic and indigenously developed, which may introduce variability. Only ZnO nano rods were tested; other materials or synthesis methods were not compared.
1：Experimental Design and Method Selection:
The experiment involved synthesizing ZnO nano rods via hydrothermal method and subjecting them to shock waves generated by a semi-automatic pressure-driven shock tube to study stability under extreme conditions. Theoretical models include the Rankine-Hugoniot relation for calculating transient pressure and temperature.
2：Sample Selection and Data Sources:
ZnO nano rods were synthesized using Zinc sulphate and Sodium Hydroxide solutions in a 1:2 ratio, washed, dried, and ground into fine powder. Four test samples were used, each subjected to different shock pulse counts (50, 100, 150, 200).
3：0).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Shock tube (indigenously developed, semi-automatic, pressure-driven), sample holder, diaphragm (120 GSM carbonless papers), air compressor, Perkin Elmer Fourier Transform Infrared Spectrometer, Varian 05 Spectrometer for UV-Vis analysis, X-ray diffractometer (model not specified), Scanning Electron Microscope (model not specified). Materials include Zinc sulphate, Sodium Hydroxide, deionized water.
4：Experimental Procedures and Operational Workflow:
Shock waves of 2.2 Mach number (2.0 MPa pressure, 864 K temperature) were generated by pressurizing the driver section until diaphragm rupture, propagating through the driven section to hit the sample placed 1 cm from the open end. Samples were shocked repeatedly at 5-second intervals for specified counts, then characterized without further processing using FT-IR, UV-Vis, XRD, and SEM.
5：2 Mach number (0 MPa pressure, 864 K temperature) were generated by pressurizing the driver section until diaphragm rupture, propagating through the driven section to hit the sample placed 1 cm from the open end. Samples were shocked repeatedly at 5-second intervals for specified counts, then characterized without further processing using FT-IR, UV-Vis, XRD, and SEM.
Data Analysis Methods:
5. Data Analysis Methods: Data analyzed using Debye-Scherrer formula for grain size calculation, X-pert high score software for d-space measurement, and comparison with JCPDS standards and literature values for structural and optical properties.
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